LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM RED (Brake) circuit alert on trailer V568337 is confirmed as a valid defect detection with high confidence (92%). The sensor correctly flagged a failed Grote auxiliary strobe/brake light on the RED circuit. Evidence from the technician's notes and supporting photos clearly supports the sensor's alert — power was confirmed present at the lamp, isolating the failure to the lamp component itself rather than upstream wiring or connector issues. The TechAssist app screenshot showing 'Defect/s resolved' on the RED circuit further validates the sensor's original detection.

Photo Evidence: Photo 1 shows the Grote 6-LED auxiliary strobe/brake light illuminated in red/amber after replacement, confirming the new lamp is functional. Photo 3 shows the same lamp position with only one LED dimly lit (amber), which is consistent with a failing or just-replaced lamp being tested — this appears to be the 'before' or during-diagnostic state, confirming the partial/full failure prior to replacement. Photo 2 and Photo 5 show the full rear of the Amazon trailer AZNG V568337 with the standard tail lights and the center Grote lamp visible; the tail lights on both sides appear functional. Photo 6 shows the nosebox/junction box with wiring visible — the box is open and wiring appears intact though somewhat congested, with a Phillips Connect component (likely the LCM sensor insert) visible. Photo 4 is the TechAssist app screenshot confirming Sensor Paired, Maintenance Verified, and all five circuits (Red, Green, Yellow, Brown, Black) showing 'Verified' status, with RED and YELLOW circuits showing 'Defect/s resolved.' Notably, no photos were provided showing all individual lights in the RED circuit illuminated simultaneously (e.g., both rear stop lights and the strobe lamp lit together), which is a minor gap in documentation per the troubleshooting procedure.

Vendor Compliance: The vendor (COX) demonstrated reasonable compliance with the LCM troubleshooting procedure. The TechAssist app was clearly used, as evidenced by the Sensor Details screenshot in Photo 4 showing all circuits verified green. The technician provided structured complaint/cause/correction notes across two labor lines, which aligns with expected diagnostic documentation. A nosebox photo was provided (Photo 6), though the image quality and angle make it difficult to fully assess all connections. The failure category of 'light failure' (worn out LED lamp) is consistent with the defined feedback categories. The primary compliance gap is that photos of all lights in the RED circuit illuminated were not fully documented — while Photos 1 and 2/5 show rear lights, a systematic walk-through photo of each RED circuit lamp lit is absent.

Repair Summary: The repair involved removal and replacement of the center rear Grote auxiliary strobe/brake LED lamp, which is the supplemental stop/brake light mounted between the standard tail lights on the trailer's rear panel. The Grote brand is compliant with Amazon's trailer lighting specifications, as evidenced by the Grote FMCSA-2020 compliance sticker visible in Photos 1 and 3. The replacement lamp appears to be the same Grote 6-LED oval-style unit. Labor was documented across two lines (diagnostic + repair), and the work order was closed with no open defects. The TechAssist app confirms the RED circuit defect was resolved. Parts were listed as a placeholder, which is a minor documentation concern but common in fleet maintenance workflows where parts are invoiced separately.

Key Concerns: There are two minor concerns worth noting. First, the TechAssist screenshot (Photo 4) shows 'Defect/s resolved' on both the RED circuit (expected, as that was the alerting circuit) and the YELLOW circuit (Left road-side turn lights) — this suggests the YELLOW circuit may have also had a prior defect that was addressed, though no separate complaint or labor line documents a YELLOW circuit repair. It is possible this was a pre-existing resolved defect carried in the system, but it warrants a quick follow-up to confirm the YELLOW circuit was not also repaired without documentation. Second, the parts line item is listed only as a 'Placeholder - Details to Follow,' meaning the specific part number, quantity, and cost for the replacement Grote lamp are not yet confirmed in the work order. This should be updated to reflect the actual part used. Overall, the work order is well-executed, the sensor performed correctly, and the repair appears complete and compliant.